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lock: Improve performance of DEBUG_THREADS.

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Add a volatile flag to lock tracking structures so we only need to use
the global lock when first initializing tracking.

Additionally add support for DEBUG_THREADS_LOOSE_ABI.  This is used by
astobj2.c to eliminate storage for tracking fields when DEBUG_THREADS is
not defined.

Change-Id: Iabd650908901843e9fff47ef1c539f0e1b8cb13b
This commit is contained in:
Corey Farrell
2018-09-27 20:32:21 -04:00
parent 628dc8d63c
commit 95dc10eb72
4 changed files with 81 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/asterisk/astobj2.h
View File

@@ -634,6 +634,9 @@ int __ao2_trylock(void *a, enum ao2_lock_req lock_how, const char *file, const c
* lock address, this allows you to correlate against
* object address, to match objects to reported locks.
*
* \warning AO2 lock objects do not include tracking fields when
* DEBUG_THREADS is not enabled.
*
* \since 1.6.1
*/
void *ao2_object_get_lockaddr(void *obj);

39
include/asterisk/lock.h
View File

@@ -92,11 +92,11 @@
#define AST_LOCK_TRACK_INIT_VALUE { { NULL }, { 0 }, 0, { NULL }, { 0 }, PTHREAD_MUTEX_INIT_VALUE }
#endif
#define AST_MUTEX_INIT_VALUE { PTHREAD_MUTEX_INIT_VALUE, NULL, 1 }
#define AST_MUTEX_INIT_VALUE_NOTRACKING { PTHREAD_MUTEX_INIT_VALUE, NULL, 0 }
#define AST_MUTEX_INIT_VALUE { PTHREAD_MUTEX_INIT_VALUE, NULL, {1, 0} }
#define AST_MUTEX_INIT_VALUE_NOTRACKING { PTHREAD_MUTEX_INIT_VALUE, NULL, {0, 0} }
#define AST_RWLOCK_INIT_VALUE { __AST_RWLOCK_INIT_VALUE, NULL, 1 }
#define AST_RWLOCK_INIT_VALUE_NOTRACKING { __AST_RWLOCK_INIT_VALUE, NULL, 0 }
#define AST_RWLOCK_INIT_VALUE { __AST_RWLOCK_INIT_VALUE, NULL, {1, 0} }
#define AST_RWLOCK_INIT_VALUE_NOTRACKING { __AST_RWLOCK_INIT_VALUE, NULL, {0, 0} }
#define AST_MAX_REENTRANCY 10
@@ -120,6 +120,13 @@ struct ast_lock_track {
pthread_mutex_t reentr_mutex;
};
struct ast_lock_track_flags {
/*! non-zero if lock tracking is enabled */
unsigned int tracking:1;
/*! non-zero if track is setup */
volatile unsigned int setup:1;
};
/*! \brief Structure for mutex and tracking information.
*
* We have tracking information in this structure regardless of DEBUG_THREADS being enabled.
@@ -127,9 +134,18 @@ struct ast_lock_track {
*/
struct ast_mutex_info {
pthread_mutex_t mutex;
/*! Track which thread holds this mutex */
#if !defined(DEBUG_THREADS) && !defined(DEBUG_THREADS_LOOSE_ABI)
/*!
* These fields are renamed to ensure they are never used when
* DEBUG_THREADS is not defined.
*/
struct ast_lock_track *_track;
struct ast_lock_track_flags _flags;
#elif defined(DEBUG_THREADS)
/*! Track which thread holds this mutex. */
struct ast_lock_track *track;
unsigned int tracking:1;
struct ast_lock_track_flags flags;
#endif
};
/*! \brief Structure for rwlock and tracking information.
@@ -139,9 +155,18 @@ struct ast_mutex_info {
*/
struct ast_rwlock_info {
pthread_rwlock_t lock;
#if !defined(DEBUG_THREADS) && !defined(DEBUG_THREADS_LOOSE_ABI)
/*!
* These fields are renamed to ensure they are never used when
* DEBUG_THREADS is not defined.
*/
struct ast_lock_track *_track;
struct ast_lock_track_flags _flags;
#elif defined(DEBUG_THREADS)
/*! Track which thread holds this lock */
struct ast_lock_track *track;
unsigned int tracking:1;
struct ast_lock_track_flags flags;
#endif
};
typedef struct ast_mutex_info ast_mutex_t;

4
main/astobj2.c
View File

@@ -25,6 +25,10 @@
<support_level>core</support_level>
***/
/* This reduces the size of lock structures within astobj2 objects when
* DEBUG_THREADS is not defined. */
#define DEBUG_THREADS_LOOSE_ABI
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

125
main/lock.c
View File

@@ -65,21 +65,16 @@ static void __dump_backtrace(struct ast_bt *bt, int canlog)
#ifdef DEBUG_THREADS
AST_MUTEX_DEFINE_STATIC(reentrancy_lock);
static inline struct ast_lock_track *ast_get_reentrancy(struct ast_lock_track **plt)
static inline struct ast_lock_track *ast_get_reentrancy(struct ast_lock_track **plt,
struct ast_lock_track_flags *flags, int no_setup)
{
pthread_mutexattr_t reentr_attr;
struct ast_lock_track *lt;
/* It's a bit painful to lock a global mutex for every access to the
* reentrancy structure, but it's necessary to ensure that we don't
* double-allocate the structure or double-initialize the reentr_mutex.
*
* If you'd like to replace this with a double-checked lock, be sure to
* properly volatile-ize everything to avoid optimizer bugs.
*
* We also have to use the underlying pthread calls for manipulating
* the mutex, because this is called from the Asterisk mutex code.
*/
if (!flags->tracking || flags->setup) {
return *plt;
}
pthread_mutex_lock(&reentrancy_lock.mutex);
if (*plt) {
@@ -87,6 +82,11 @@ static inline struct ast_lock_track *ast_get_reentrancy(struct ast_lock_track **
return *plt;
}
if (no_setup) {
pthread_mutex_unlock(&reentrancy_lock.mutex);
return NULL;
}
lt = *plt = ast_std_calloc(1, sizeof(*lt));
if (!lt) {
fprintf(stderr, "%s: Failed to allocate lock tracking\n", __func__);
@@ -103,6 +103,7 @@ static inline struct ast_lock_track *ast_get_reentrancy(struct ast_lock_track **
pthread_mutex_init(&lt->reentr_mutex, &reentr_attr);
pthread_mutexattr_destroy(&reentr_attr);
flags->setup = 1;
pthread_mutex_unlock(&reentrancy_lock.mutex);
return lt;
}
@@ -141,7 +142,8 @@ int __ast_pthread_mutex_init(int tracking, const char *filename, int lineno, con
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
t->track = NULL;
t->tracking = tracking;
t->flags.tracking = tracking;
t->flags.setup = 0;
#endif /* DEBUG_THREADS */
pthread_mutexattr_init(&attr);
@@ -158,8 +160,8 @@ int __ast_pthread_mutex_destroy(const char *filename, int lineno, const char *fu
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = t->track;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 1);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
@@ -236,16 +238,12 @@ int __ast_pthread_mutex_lock(const char *filename, int lineno, const char *func,
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -360,16 +358,12 @@ int __ast_pthread_mutex_trylock(const char *filename, int lineno, const char *fu
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -425,7 +419,7 @@ int __ast_pthread_mutex_unlock(const char *filename, int lineno, const char *fun
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
@@ -439,10 +433,7 @@ int __ast_pthread_mutex_unlock(const char *filename, int lineno, const char *fun
}
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
lt = ast_get_reentrancy(&t->track, &t->flags, 0);
if (lt) {
ast_reentrancy_lock(lt);
if (lt->reentrancy && (lt->thread_id[ROFFSET] != pthread_self())) {
@@ -554,7 +545,7 @@ int __ast_cond_wait(const char *filename, int lineno, const char *func,
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
struct ast_lock_track lt_orig;
int canlog = t->tracking && strcmp(filename, "logger.c");
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
@@ -565,10 +556,7 @@ int __ast_cond_wait(const char *filename, int lineno, const char *func,
}
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
lt = ast_get_reentrancy(&t->track, &t->flags, 0);
if (lt) {
ast_reentrancy_lock(lt);
if (lt->reentrancy && (lt->thread_id[ROFFSET] != pthread_self())) {
@@ -622,7 +610,7 @@ int __ast_cond_timedwait(const char *filename, int lineno, const char *func,
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
struct ast_lock_track lt_orig;
int canlog = t->tracking && strcmp(filename, "logger.c");
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
@@ -633,10 +621,7 @@ int __ast_cond_timedwait(const char *filename, int lineno, const char *func,
}
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
lt = ast_get_reentrancy(&t->track, &t->flags, 0);
if (lt) {
ast_reentrancy_lock(lt);
if (lt->reentrancy && (lt->thread_id[ROFFSET] != pthread_self())) {
@@ -699,7 +684,8 @@ int __ast_rwlock_init(int tracking, const char *filename, int lineno, const char
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
t->track = NULL;
t->tracking = tracking;
t->flags.tracking = tracking;
t->flags.setup = 0;
#endif /* DEBUG_THREADS */
pthread_rwlockattr_init(&attr);
@@ -717,8 +703,8 @@ int __ast_rwlock_destroy(const char *filename, int lineno, const char *func, con
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = t->track;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 1);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
if (t->lock == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
@@ -765,7 +751,7 @@ int __ast_rwlock_unlock(const char *filename, int line, const char *func, ast_rw
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
@@ -780,10 +766,7 @@ int __ast_rwlock_unlock(const char *filename, int line, const char *func, ast_rw
}
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
lt = ast_get_reentrancy(&t->track, &t->flags, 0);
if (lt) {
ast_reentrancy_lock(lt);
if (lt->reentrancy) {
@@ -844,16 +827,12 @@ int __ast_rwlock_rdlock(const char *filename, int line, const char *func, ast_rw
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -953,16 +932,12 @@ int __ast_rwlock_wrlock(const char *filename, int line, const char *func, ast_rw
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -1062,16 +1037,12 @@ int __ast_rwlock_timedrdlock(const char *filename, int line, const char *func, a
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -1155,16 +1126,12 @@ int __ast_rwlock_timedwrlock(const char *filename, int line, const char *func, a
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
int canlog = t->tracking && strcmp(filename, "logger.c");
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
int canlog = t->flags.tracking && strcmp(filename, "logger.c");
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -1247,15 +1214,11 @@ int __ast_rwlock_tryrdlock(const char *filename, int line, const char *func, ast
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;
@@ -1306,15 +1269,11 @@ int __ast_rwlock_trywrlock(const char *filename, int line, const char *func, ast
int res;
#ifdef DEBUG_THREADS
struct ast_lock_track *lt = NULL;
struct ast_lock_track *lt = ast_get_reentrancy(&t->track, &t->flags, 0);
#ifdef HAVE_BKTR
struct ast_bt *bt = NULL;
#endif
if (t->tracking) {
lt = ast_get_reentrancy(&t->track);
}
if (lt) {
#ifdef HAVE_BKTR
struct ast_bt tmp;